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Me--->
I consider ambient shadow to be a minimum requirement for seeing any depth in a render.
Anything else is calculated after I have rendered and saved a 1:2 anti-aliased image file and the M3I file.
I can then reopen the M3I file, add Postprocess effects and save a new image file.
DOF calc time is usually short so I use it more often.
Hard Shadows and/or Reflections are calculation intensive so I rarely use them.
When I do, I blend the Ambient Shadow image with the separate Hard Shadows and/or Reflections image in Photoshop using layers.
That is my short answer ...
I just wanted to encourage you to use more or more intense shadows - but that's obviously just my taste and if you think it's a not so good idea to bother an artist with personal taste proposals I even would agree ...
Peace!
If I had unlimited processing power I would calculate Hard Shadows, Reflection, DOF and Transparency on all.
FYI, I do not consider your question any bother at all.
I appreciate you taking an interest.
- that's why I got stuck with very simple & calculation friendly formulas ...